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Old 01-12-2014, 07:21 PM   #1
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Gear Ratio for 2013 Jeep Wrangler Sport with 35 Inch

What gear ratio should I run with my 2013 Jeep Wrangler Sport Automatic with 35 inch tires? I will be driving mostly city and highway. I may take it trail riding 1-2 times per year.

Also what tire pressure do you recommend for 35x1250x17?

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Old 01-12-2014, 07:48 PM   #2
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Asking for recommended tire pressure based on tire size alone is worthless. Google "tire chalk test" to learn the best method for determining what pressure is best for YOUR tires.

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Old 01-12-2014, 08:10 PM   #3
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4.56 gear ratio works well with your setup. 30 psi is a good place to start.
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Old 01-13-2014, 12:58 PM   #4
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The offroad garage is recommending 4.88 gear. What you guys think?
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Old 01-13-2014, 01:17 PM   #5
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I think either 4.56 or 4.88 will work. There is a premium for the 4.56 which are a little more pricey generally. If you go with the 4.88's you have room to grow. You will be sacrificing one thing or the other no matter which you go with. Air pressure, that is entirely up to you to decide. No one can tell you what the best air pressure for you is.
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Old 01-13-2014, 01:30 PM   #6
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for an auto i would do 488. also if you want to move up top 37s the 488s should work as well
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Old 01-13-2014, 01:34 PM   #7
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What type of terrain are you wheeling in?
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Old 01-13-2014, 01:35 PM   #8
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Same setup and I plan to go 4.56. 4.88 will be over 3k rpm highway at 75 so that's why I am choosing 4.56. But to each his own.
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Old 01-13-2014, 01:41 PM   #9
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Here is the chart if anyone is wondering.
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Old 01-13-2014, 02:10 PM   #10
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Thanks. This will definitely help. What do think Is a fair price to change gears to 456 or 488 and have them programmed?
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Old 01-13-2014, 02:15 PM   #11
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Desert Rat here in AZ does gears for 999 bucks, thats gears and install. I believe 4wheelparts also does the same deal. You can buy the gears as a kit from places like Northridge 4x4 starting at 599. That gives you the gears and master install kit. If your Jeep is brand new you may not need the master install kit just the minor. So, I guess 999 is reasonable. I am sure you could find somewhere that could do it for cheaper. Ask them about warranties for the install. Some places will warrant the labor for longer than others. Buy a programmer. No need for anyone to do it for you. The programmer will allow you to change many settings and you can use it more than once.
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Old 01-13-2014, 06:04 PM   #12
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Just brought my 2013 Jeep Wrangler Sport Automatic with 3.21 home with the new 35s. It didn't seem to lack any power. I was at a complete stop and had to go up a hill by my house and it went up the hill with no issues. Every chart and everyone I talk to tells me that I need to get 4.56 or 4.88. Do I really need that much and why?
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Old 01-13-2014, 06:50 PM   #13
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Quote:
Originally Posted by leegrafton View Post
What gear ratio should I run with my 2013 Jeep Wrangler Sport Automatic with 35 inch tires? I will be driving mostly city and highway. I may take it trail riding 1-2 times per year.

Also what tire pressure do you recommend for 35x1250x17?
If you don't trail ride very often- I doubt you'll ever see 37s. So 4.56s IMO. The main reasons (typically) for 4.88s is 37s or crawl ratio for trails. Many shops recommend 4.88s because they're used to the 3.8L- and 4.56s are relatively new. (Most gear companies charge the same no matter what the ratio- but there may be exceptions.)
Of course some folks prefer 4.88s. Its not scientific.
I found this to be most helpful- you don't just drive on the highway and this calculates several speeds.
Gear Ratio Calculator
Quote:
Originally Posted by leegrafton View Post
Just brought my 2013 Jeep Wrangler Sport Automatic with 3.21 home with the new 35s. It didn't seem to lack any power. I was at a complete stop and had to go up a hill by my house and it went up the hill with no issues. Every chart and everyone I talk to tells me that I need to get 4.56 or 4.88. Do I really need that much and why?
If 35s/3.21s don't bother you- no need to re-gear. If you test drove it and bought it with 35s you're used to how it drives (on 35s). However-most folks bought their Jeeps with stock tires. Swap those for 35s and the engine/power band feels sapped by comparison. So many people re-gear to recover the performance they had with stock tires. (Me included). Not to mention better performance on the trail.
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Old 01-13-2014, 07:23 PM   #14
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If 35s/3.21s don't bother you- no need to re-gear. If you test drove it and bought it with 35s you're used to how it drives (on 35s). However-most folks bought their Jeeps with stock tires. Swap those for 35s and the engine/power band feels sapped by comparison. So many people re-gear to recover the performance they had with stock tires. (Me included). Not to mention better performance on the trail.
Thanks Your Info has been very helpful. I did buy the jeep with stock tires. I just had 35s put on them today. I didn't notice much change in power at all.
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Old 01-13-2014, 09:07 PM   #15
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Did you reprogram for the larger tire size?
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Old 01-13-2014, 09:29 PM   #16
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I run 488s with my 35s. At 30 lbs. I also tow a pop up camper with my JKU
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Old 01-14-2014, 05:32 AM   #17
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Did you reprogram for the larger tire size?
Did not reprogram for larger tires.
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Old 01-14-2014, 06:25 AM   #18
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I have 35's and plan on going 5.13 i have a short commute , not much hwy, but idk about gas mileage.. i would rather go slower. comming from 3.21 i should see a huge difference after wheeling for 2 years on 3.21 gears.
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Old 01-14-2014, 06:26 AM   #19
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Quote:
Originally Posted by JeepHerz View Post

If you don't trail ride very often- I doubt you'll ever see 37s. So 4.56s IMO. The main reasons (typically) for 4.88s is 37s or crawl ratio for trails. Many shops recommend 4.88s because they're used to the 3.8L- and 4.56s are relatively new. (Most gear companies charge the same no matter what the ratio- but there may be exceptions.)
Of course some folks prefer 4.88s. Its not scientific.
I found this to be most helpful- you don't just drive on the highway and this calculates several speeds.
[URL="http://www.grimmjeeper.com/gears.html"]Gear Ratio
Originally I was going to do 4.56's in my 3.8 6spd manual with 33's but after doing this calc and comparing the rpm's at 45,65 & 70 makes me reconsider 4.10's

I generally drive the highway daily and with 33" tires, 65 in 6th would be 2291rpms with 4.10 and 2548 with 4.56

If I did 35's(not 100% sure on this yet) 65 in 6th would be 2174 with 4.10 and 2418 with 4.56.

I do eventually plan to get a trailer for occasional use but I guess the big question now to figure out is what tire size I want to stay with.
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Old 01-14-2014, 06:55 AM   #20
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OP set cruise at 70 mph hit the freeway into a wind. Even a slight wind and small hill and see how often the tranny is shifting. That's why you need a lower gear. I only have 33's and in W. OK where relatively flat but windy as hell, since the 33's went in it is shifting as low as 3rd on I40 into wind and small hills. Yes it will work and drive, but could work so much better.
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Old 01-14-2014, 10:25 AM   #21
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I can't stand 35s with anything lower than 4.10s, but 4.56 would be ideal for overall driving. Since I can't get anything more than 4.10s from the factory, I ordered my Rubi with that, and paid the $500 upcharge scam. I can live with 4.10s at least for a while.
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Old 01-14-2014, 12:53 PM   #22
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I have 35's with the factory 3.73 and did a Superchips Tune to change the speedo and add a bit of extra power. Doesn't feel slow in the least bit in any gear. Off the line is usually where it hurts and it's quick getting up to speed. This is on a 2-door so it's, what, 400lbs lighter than a 4-door? Manual windows and doors...

I'm sure something like a 4.56 would make it that much quicker off the line, but i just can't see the need, especially at $1,000. And compared to the old 3.8, it's not even in the same ball park for quickness and drivability.
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Old 01-14-2014, 12:57 PM   #23
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I have 35's with the factory 3.73 and did a Superchips Tune to change the speedo and add a bit of extra power. Doesn't feel slow in the least bit in any gear. Off the line is usually where it hurts and it's quick getting up to speed. This is on a 2-door so it's, what, 400lbs lighter than a 4-door? Manual windows and doors...

I'm sure something like a 4.56 would make it that much quicker off the line, but i just can't see the need, especially at $1,000. And compared to the old 3.8, it's not even in the same ball park for quickness and drivability.
I don't know how often you drive up and down steep or long hills but when your vehicle has to down shift to stay at speed at even the slightest hill it is nice to have the proper gears. I am not a speed demon so I dont worry about launch speed but I would like to stay in gear when I have the cruise control on going 75 on the highway.
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Old 01-14-2014, 12:59 PM   #24
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I don't know how often you drive up and down steep or long hills but when your vehicle has to down shift to stay at speed at even the slightest hill it is nice to have the proper gears. I am not a speed demon so I dont worry about launch speed but I would like to stay in gear when I have the cruise control on going 75 on the highway.
Mostly all hills here in NC. But not long, dragging freeway hills (unless I'm traveling). No issues with downshifting or lack of power now though. Even my neighborhood is all hills up and down. It'll run at, say, 40mph up and down without ever shifting out of gear. My 2007 with the 3.8 did, absolutely!

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